/ˈrɛlətɪv θruː ˈwɛdlɒk/ – Phrase
Definition: thông gia, sui gia.
A more thorough explanation: A relative through wedlock refers to a family member who is related to an individual by blood or marriage within the confines of a legal marriage. This term typically includes immediate family members such as parents, siblings, children, and spouses.
Example: The child was entitled to inherit the estate as a relative through wedlock.